Abstract
Numerical simulation of Kanpachi cloud, i. e. generated just over the Kanpachi Street under calm and clear atmospheric conditions, has been performed by RAMS (Regional Atmospheric Modeling System). The method of Four-Dimensional Data Assimilation (4DDA) and Nest Grid System, the most advanced meteorological prediction techniques, are used in this simulation.Simulated wind field and cloud in the morning predicted by the model agree very well with those of the observation by Kai et al.(1995). Additionally, the cloud line that was observed in the afternoon and a local convergent flow due to two sea breezes (one from Sagami Bay and another from Tokyo Bay) could also be simulated although the simulated cloud is rather underestimated. These numerical results suggest that Kanpachi cloud in the afternoon has some different mechanism from that in the morning such as aerosol effect of urban pollution to cloud formation.
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